Check the error message:
530 Login failed: Maximum concurrent connections for single host reached.
The first thing ioFTPD does, is check the connections per IP. For that, it uses \etc\Hosts.Rules. If the default policy is set to "POLICY ACCEPT 3" for example, it will only accept 3 connections per IP, even if they all login with an account that has unlimited logins. Most people will allow more connections for administrative use. For example:
Code:
POLICY ACCEPT 3
CLASS ADMIN -1
ACCEPT I 127.0.0. ADMIN -1
ACCEPT I 192.168.0. ADMIN -1
ACCEPT I 212.123.53.47 ADMIN -1
This allows unlimited connections from the "ADMIN" class, in this example: localhost (127.*), LAN (192.168.*) and the fixed IP of an administrator.